Onset of isomers in Cd125,126,127,128 and weakened neutron-neutron interaction strength

N. Hoteling, W. B. Walters, B. E. Tomlin, P. F. Mantica, J. Pereira, A. Becerril, T. Fleckenstein, A. A. Hecht, G. Lorusso, M. Quinn, J. S. Pinter, and J. B. Stoker
Phys. Rev. C 76, 044324 – Published 29 October 2007

Abstract

The presence of isomeric levels with half-lives in the microsecond range has been identified in Cd125,126,127,128. Neutron-rich Cd isotopes were produced from the fragmentation of a 120 MeV/nucleon Xe136 beam and uniquely identified through their time-of-flight, energy loss, and total kinetic energy. γ rays from these isomeric levels were measured with an array of Ge detectors that were gated for 15 μs by a particle implantation trigger from a stack of Si detectors. The γ rays observed in the decay of Cd126,128 isomers populate low-energy levels previously identified in the β decay of Ag126,128. The γ rays found in the decay of Cd125,127 isomers are consistent with expected yrast structures observed in lighter, odd-mass Cd isotopes. The appearance of these isomers at the point where N/Z exceeds 1.6 is interpreted as an indication of the onset of a weakened neutron-neutron interaction that has been proposed for Sn134, whose N/Z also exceeds 1.6.

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  • Received 21 May 2007

DOI:https://doi.org/10.1103/PhysRevC.76.044324

©2007 American Physical Society

Authors & Affiliations

N. Hoteling1,2, W. B. Walters1, B. E. Tomlin3,4, P. F. Mantica3,4, J. Pereira3,5, A. Becerril3,6, T. Fleckenstein5, A. A. Hecht1,2, G. Lorusso3,6, M. Quinn7, J. S. Pinter3,4, and J. B. Stoker3,4

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
  • 2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 4Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
  • 5Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
  • 6Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 7Department of Physics, University of Notre Dame, South Bend, Indiana 46556, USA

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Issue

Vol. 76, Iss. 4 — October 2007

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